Fill in the required parameters and click Invoke. (This first call may fail so do it a second time if required).NOTE: You may need to tick on preauthenticate to TRUE.

The output window will show information if it suceeded. If it did not, go to the Request/Response tab and view the Response text. The response text will show if the call worked or whether it failed and what the reason is.

The above process can also be repeated on each Web Front End server in the Farm if there is no issue from the client machine.